Any alteration in design would mean re-setting our machines, and the cost of this would be prohibitive ____ you could place an o

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问题 Any alteration in design would mean re-setting our machines, and the cost of this would be prohibitive ____ you could place an order for more than 5,000.

选项 A、until
B、with
C、unless
D、when

答案 C

解析
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